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(No Model.)

H. A. A. T-HORN. SINGLE TRIGGER MBGHANISM FOR GUNS. ANO- 602,610- Patented Apr. 19,1898.

Nrren STATES eric.

arena* SINGLE-TRIGGER MECHANISM FOR GUNS.

SPECIFICATION forming part of Letters Patent No. 602,610, dated .April 19, 189e. Application tiled Angnst 5, 1895. Serial No. 558,256. (No model.) Patented in England March 15, 1895, No. 5,517. l

.To a/ZZ whom it may concern:

Be it known that I, HENRY ALFRED ALEX- ANDER THORN, a subject of theQueen of Great Britain, residing at London, England, have linvented new and useful Improvements in charge is due to the recoil of the gun momentarily freeing the trigger from the pressure of the finger and the rebound of the gun pushing the trigger against the finger, which naturally follows the trigger to a certain `extent during the recoil. According to my invention I overcome these objections by employing a switching trigger-blade of novel conl struction arranged in conjunction with what I term a time-stud and by the employment of Ia lever operated by a cam-surface on one of the tumblers, the said lever being mounted upon a slide, all as hereinafter described.

In the accompanying drawings, Figure l is an elevation of breech mechanism having my improvements applied thereto, one lock being removed. Fig. 2 is a sectional plan; and Fig. 3 is a view similar to Fig. 2, but showing the parts in different positions. Fig. et is an elevation of the right-hand tumbler of the gun detached; and Fig. 5 is a section on the line 5 5, Fig. 4. Figs. 6 and 7 are an elevation and plan, respectively, of the lever operated by the tumbler; and Figs. 8, 9, and l0 are respectively a side elevation, a pian, and anend elevation of the slide upon which the said lever is mounted.

a of indicate 'the right and left barrels, respectively, and b b' the respective tumblers for the same, each of which has arranged in conjunction with it a sear c.

d is my improved switching trigger-blade, which is pivotally mounted on a stud e, fixed to the trigger f, which is pivoted at g in a trigger-box h, the said trigger being arranged to engage with either of thesears c c in the usual manner and having a broadened rear end.

't' is my timing stud or stop arranged in combination with the switching trigger-blade, the said timing-stud havinga lip or ange 7`,which projects intothe path of the rear end of the -switching trigger-blade and prevents the' movement of the same out of engagement with one of the sears and into engagement with the other except when the said switching triggerblade is in its normal position, a slot k being formed in the rear end of the said switching trigger-blade to allow the latter to pass the serves to move the said switching triggerblade from right to left when iny its lowerxnost position and keeps the switching tri gger-blade to the sears.

With this arrangement it will be understood that when the trigger is pulled the switching trigger-blade will be lifted-for instance, to'

the position indicated by the dotted lines in Fig. l-so that the slot lo is moved out of alinement with the lplyl of the time-stop, thereby preventing the said switching triggerblade from moving from right to left. When the gun is fired, the pressure of the finger on the trigger will be relieved, thereby allowing the switching trigger-blade to move downward a certain extent; but as the inger will involuntarily follow the trigger as the gun ref coils this downward movement of the switch.- ing trigger-blade will not 'be suiiicient to bring the slot 7c opposite to ,the lip j, so that when on the rebound of' the gun the trigger is again pressed tightly against the finger the only eect will be to again raise the switching trigger-blade to the position indicated by the dotted lines. n When after the rst barrel has been iired the trigger is fully released, the slot lo will come opposite to the .lip j, thereby allowing the switching trigger-blade .time-stop in this position. Z is a spring which to move over into engagement with the sear fn, and having atl one end a finger 0, which bears against the left-hand side of the switching trigger-blade, and at the other end a cam projection lo, which works in conjunction with a cam-recess q, formed on the tumbler b. So long as the tumbler of the right-hand barrel is in the cocked position (shown in Figs. 1 and 2) the cam projection p will rest against the iiat surface r, adjacent to the cam-recess q, as shown in the said figures, so that the finger o retains the switching trigger-blade in its right-hand position against the pressure of thespringl. Vhen, however, upon the discharge of the right-hand barrel the tumbler moves forward, the cam-recess q in the tumbler moves opposite to the cam projection p, whereby the latter moves into the said camrecess under the action of the spring Z, as will be readily understood by reference to Fig. 3, which shows the positionpof the parts after the right-hand barrel hasV been discharged and the switching trigger-blade has moved over into engagement with the sear of the lefthand tumbler. vWhen the tumblerb is again cocked, owing'to the opening of the breech in the usual manner, the inclined surface of the cam-'recess q by acting upon the cam proj ection p will again move the leverl to the position shown in Figs. l and 2, moving the switching trigger-blade into engagement with the sear of the right-hand lock. i

s is the slide to which the pivot n of the lever m is attached, as clearly shown in Figs. 8 to 10, and by means of which the left-hand barrel may be discharged irst or used con tinuously, if desired. 'This slide is capable of moving a distance suflicient to move the cam projection p from the position shown in Fig. 2 (in which it bears upon the flat surface r of the tumbler) into the position shown in Fig. 3, (where it is opposite to the cam-recess q,) so that while the tumbler of the righthand barrel remains cocked the switchingblade may be allowed to move over into en' gagement with the sear of the left-hand lock to ire the left-hand barrel without Iiring the right-hand barrel first. If itis desired to discharge the right-hand barrel, it is, only necessary to move back the slide from the position shown in Fig. 3 to that shown in Fig. 2, which is the normal position.

The slide s is provided with a finger-piece and spring-blade u, the latter having a projection o thereon designed to engage with either of the vtwo notches w w', Fig. l, corresponding with the two positions of the slide.

Although I have shown and described my invention as applied to what is known as a side or detachable lock gun, it is obvious that it is equally applicable to what is known as a bodyor box lock gun by simply forming on the lever m a cam projection 1J, designed to be operated by the back of the tumbler instead of by a'cam-recess therein.

It will also be obvious that my improvements may be arranged so that the left-hand barrel will be discharged first instead of the right, as hereinbeforedescribed.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In a double-barreled firearm, the com bination with the hammers each provided with a sear, of a single trigger, a switching trigger-blade pivotally connected with said trigger, a retaining device for holding said blade in operative relation 'with the sear of one hammer, having a part engaging the said hammer in its cocked position, a springfor forcing said blade into operative relation with the sear of the other hammer, when released by said retaining device, and a part located on the exterior of the lock and connected with said retaining device for withdrawing the same to allow the blade to shift, substantially vas described.

2. In a double-barreled firearm the combination with the ham mers, and a seail for each hammer, of a single trigger, a switching trigger-blade pivotally connected with said trigger and adapted to move transversely of the lock and said blade being provided with a slot, means for holding said blade normally in operative relation with the sear of one hammer, devices for moving said blade into operative relation with the sear of the other hamm er, and the stationary time-stop located intermediate the twO operative positions of said blade, and having'a part in linewith the slot in said blade, substantially as described.

HENRY ALFRED ALEXANDER TIIORN.

lVitnesses:

G. F. REDFERN, JOHN E. BoUsFinLn.

IOO 

